Whenever a nontoken permanent is put into your graveyard from the battlefield, Jinxed Ring deals 1 damage to you.Sacrifice a creature: Target opponent gains control of Jinxed Ring. (This effect lasts indefinitely.)
Spike Feeder enters with two +1/+1 counters on it., Remove a +1/+1 counter from Spike Feeder: Put a +1/+1 counter on target creature.Remove a +1/+1 counter from Spike Feeder: You gain 2 life.
Whenever a creature enters, if there are two or more other creatures on the battlefield, exile that creature. Return that card to the battlefield under its owner's control when Portcullis leaves the battlefield.
If you would draw a card, you may put a study counter on Pursuit of Knowledge instead.Remove three study counters from Pursuit of Knowledge, Sacrifice Pursuit of Knowledge: Draw seven cards.
Skeleton Scavengers enters with a +1/+1 counter on it.Pay for each +1/+1 counter on Skeleton Scavengers: Regenerate Skeleton Scavengers. When it regenerates this way, put a +1/+1 counter on it.
Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)Target land becomes a 2/2 creature that's still a land. (This effect lasts indefinitely.)
Spike Breeder enters with three +1/+1 counters on it., Remove a +1/+1 counter from Spike Breeder: Put a +1/+1 counter on target creature., Remove a +1/+1 counter from Spike Breeder: Create a 1/1 green Spike creature token.
As an additional cost to cast this spell, sacrifice a creature.Search your library for a card with the same name as target nontoken creature, put that card onto the battlefield, then shuffle.